Electric lamp



May 11, 1937. 5 GRANT 2,079,801

ELECTRIC LAMP Filed Feb. 25, 1935 INVENTOR ALBERT E. (71mm I together.

Patented May" 111,: 1937 y PATENT OFFICE ELEUIRIO mm Albert a. Grant, New York, N. Y., Application February 25, 1935, Serial No. 8,032

2 Claims.

My invention relates to electric lamps and the principal object of my invention is to provide a lamp having a base of very simple and economical construction by means of which the 5 .current supply wires may be connected directly to the lamp. Viewed in another "aspect, the

principal object of my invention is to provide a lamp and socket combination of improved construction, composed of few parts, and obtaining 9 good contact and good insulation of the conducting elements. a

The invention is directed particularly to electric lamps which are wired together in circuit for decorative purposes, such as Christmas tree 13 ornamentation, and a further principal object of my invention is to provide a lamp having means whereby a plurality of them may be wired either in series circuit or parallel circuit, depending on whether it is desired to utilize lamps which are each capable of carrying the full voltage of the. current supply, or to pyramid the resistance of a plurality of lamps in a relatively high voltage circuit, as is usual in illuminating Chrlstmastrees, etc. A further object is to 25 provide a lamp having improved and simplified means of contact, and other and further objects will appear from the following specification.

Referring to the drawing which forms a. part of this specification:

Figure 1 is an elevation of my improved lamp, the base and stem portions being shown in cross section.

, Figure 2 is a sectional view taken on line 2--2 of Figure. l.

Figure 3 is a sectiori taken on line 3-3 of Figure 1 and illustrates the manner in which the lamp is wired in parallel, circuit,

Figure 4 a view similar to Figure 3 and illustrates the manner in which the lamp is 40 wired inxseries circuit. I I. Figure dis a view similar to Figures 3 and 4 1showingthewiring removed to disclose the re- K 4 fi fi fi the base.

Figure" 6 shows the underside of a modified 45 base in which binding terminals are employed for securing the wiring and the lamp contacts Figure? is a sectional view of the base and stem portions of the lamp, taken on line 1-1 5 0 of. Figure 6. 1

55 body portion of the base, v

,The globe of the lamp l0 has an integral stem portion II in which conductors l2--l2 are fused, the conductors being, bent to iorm an arbor adjacent their upper ends where they are bridged by filament l2. The conductors are formed '01. still metal, somewhat heavier than ordinarily employed in lamps, and extend exteriorly of the globe below the stem to form parallel contact prongs which are preferably sharpened to points capable of perforating and penetrating-the insulative covering on the current supply wires.

The lamp base, which may also be regarded as a lamp socket, comprises the body portion [3, preferably formed of moulded insulating material. The top of the body portion is recessed at H to form a well or socket chamber which is proportioned to receive the neck or stem portion ii of the globe in close fitting engagement. The bottom of the portion I3 is recessed to define the intercommunicating passage slots or grooves l5, I6, I! and I8, respectively, as best illustrated in Figure 5. I

Passages l9 and 20, respectively, are formed in the body portion l3 and extend from the floor of the well or socket chamber I4 into communication with the grooves I5 and I6 and are spaced, positioned and proportioned to receive the prong portions of the conductors l2-'-i2 in the body portion by means of the screw 22 and is further secured by means of a clamp 28 which has clutch fingers 29-49 etc., adapted to pass thru the registered notches 24 and 2.1 and to be rotated to engageover the flange 23.

Where the lamp is to be connected'in parallel circuit, the current supply wires 30 and 3|, respectively, may be passed thru the grooves l5 and IS, the base plate then being assembled by means of screw 22 and clamp 28, whereafter the extended and sharpened prong portions of the lamp conductors are pushed thru the passages l9 and 20 until they perforatdnnd penetrate the wire insulation and obtain contact with the current supply wires, thereby also holding the wires in position in the grooves. To replace a lamp,

the old one may be removed by; simple withdrawal and a new one inserted.

Where the lamp is to be connected in series circuit, the wires are arranged in the body portion as shown in Figure 4, one of the wires (3|) being snubbed around the shoulder 35 defined by the grooves l5, l6 and I8, and the other wire being divided and its divisions extending into the slots I5 and I6, respectively, to overlie the ends of the passages I9 and 20.

When assembled and used as above described, the body portion l3 'together with base plate 25 and clamp 28 comprises a simple and efiicient the base is wired and before the base plate is assembled, as will be readily understood.

Referring to the modification illustrated in Figures'fi and Lethe body portion-35 is recessed at its top and flanged at its bottom similarly as is the portion l3, but the lower surface is additionally recessed over the areas defined in dotted lines of Figures 4 and 5, and also to receive bushings 36-36 which are threaded for binding screws 31-31. Where this modified body portion is employed it is not necessary to sharpen the prong portions of the conductors because the conductor ends are bent over for engagement by the binding screws, as illustrated. In wiring this base,

" permanently, I prefer the current supply wires are stripped of insula tion for contact with the screws 31 and the lamp series circuit wiring .the

obtained between the lamp and the socket. When the body portion is permanently secured to the bulb to form a lamp base, the material of the body portion may be any of the less resilient moulded compositions commonly employed, such as hard rubber, bakelite, porcelain, etc.

Where it is desired to install the lamp more to secure the base plate 25 and clamp 28 to the place of attachment by means of a screw 40, as indicated in broken lines of Figure l, whereafter the body portion l3, or the body portion 35, carrying the current wires, is inserted in the clamp.

Having thus described my invention, I claim:

1. An'electric lamp consisting solely of a glass bulbhaving a filament therein and a stiff conducting wire extending irom each end of said filament exteriorly of the bulb, the exteriorly extending portions of said wires forming a pair of parallel prongs having sharp points.

2. An electric lamp consisting entirely of a integral heavy walled neck glass bulb having an portion, a filament in the bulb and a still. wire conductor extending from each end of the filament exteriorly thru said neck portion, the exteriorly extending portions of said conductors forminga pair of parallel prongs.

ALBERT E. GRANT.

30 are also stripped and 

